I have a City Series Jogger, I LOVE IT. My kids are 22m, 19m, 2y3m,3y and 2y3m apart..(6) I have had several in line, I do not like because one seat never goes back far enough for the child to rest and at some point the legs get too long or they out grow the seat. Stearing is hard when you have the bigger one in front(because the youngest needs to lay down in the back) but you can't steer..the weight should(is made) to be in the rear. Not sure what kind of activity you do, but this works for amusement parks, shopping, running,off-roading. EVERYTHING. I have had it five years, the ONLY thing wrong with it now, is the gripper handle is coming off..that is it. I use it ALL THE TIME! My kids push it (super easy) steering is either locked or swivel they pile on. I have had 5 in it at one time, one on top of another, no problems! the wheels are rubber air filled, shocks. It fits into 99% of the doors. My front door standard size! Some isles in stores not so well, but usually get it in. I have spent $$$$on different strollers and wish I would have got this years ago. Could have bought a car by now;) This is a pricy one but you wont need another. My kids all still want to ride depending on what we are doing...my oldest 2 can not, but the 7y down to 19m do. We are busy active family and this stroller has saved many of backs! This link is for the mini (I have the regular one) but you can have the car seat adapter for either, this one is less expensive, I do not know how well it holds up.
http://www.amazon.com/Baby-Jogger-Car-Seat-Adaptor/dp/B00...
This is for the "regular" one I have
http://www.joggingstroller.com/Baby-Jogger-City-Series-Do...
Some people say their kids never rode...maybe the stroller was not comfortable I do not know, I do know that with the 6 I have (3ofeach) they ALL at some point WANT to ride...enjoy your stroller shopping. Take the children out and have them sit in the strollers in the store and try driving it have bigger kids sit in the stroller you want, just like a car seat, they change shape and lengths on the body parts and it is definitely different with the weight, so sometimes the fit is not a good one, with other kids of different ages(if possible) it really does help see the difference. The handle on the City Series Double moves up and down for shorter drivers or taller ones. I have no complaints about this stroller. My 7yr old is getting a bit too tall for it(his head is starting to touch the canopy) but normally you don't push a 7yr old...only at Sea World after the day is up!(usually the older ones sit on the foot rest and get a "ride" back to the car:) I never used the infant seat..I used the bundle me..lite for summer and regular for winter, but the sway of the seat seems to put them back out if they happen to wake..